Do you have major gas in your intestine? It's so pain and uncomfortable! I'm thinking to have a colonyscopy but afraid the drink solution would do harm/hurt our stomach lining! Would it??

Hi, You don't drink any solution for a Colonoscopy. You do that for a CT Scan.
For a Colonoscopy you take some kind of laxative to clean out your bowel 24 hrs beforehand.
It is not a problem (Ive had two) just an inconvenience as you spend quite a bit of time in the bathroom.
Solofelix.